Question

我正在尝试使用FileWriter和PrintWriter来保存我的textpane上的内容。

// Save file
    fileItem2.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent e) {
            System.out.println("Pressed menu item! Save");
            jStyledTextPane.setText("Pressed menu item! Save");
        }
    });

我已经有了一个打开文件的方法，我正在试着在textpane上显示的文本。 这是我的完整代码：

public class CSC9V4TextEditor implements ActionListener {

private JStyledTextPane jStyledTextPane;

private JMenuBar menubar() {

    // Initialising JMenu.
    JMenuBar menubar = new JMenuBar();

    // Creating the Menus.
    JMenu filemenu = new JMenu("File");
    filemenu.add(new JSeparator());

    // Creating the sub Menus.
    JMenuItem fileItem1 = new JMenuItem("Open");
    JMenuItem fileItem2 = new JMenuItem("Save");
    JMenuItem fileItem3 = new JMenuItem("Exit");
    fileItem3.add(new JSeparator());

    // Adding the sub Menus to the File menu.
    filemenu.add(fileItem1);
    filemenu.add(fileItem2);
    filemenu.add(fileItem3);

    // Adding the sub Menus to the Edit menu.
    menubar.add(filemenu);

    // Exit action
    fileItem3.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent e) {
            System.out.println("Exit");
            System.exit(0);
        }
    });

    // open file
    fileItem1.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent e) {
            JFileChooser chooser = new JFileChooser();
            Component parent = null;
            int returnVal = chooser.showOpenDialog(parent);
            if (returnVal == JFileChooser.APPROVE_OPTION) {
                System.out.println("You chose to open this file: "
                        + chooser.getSelectedFile().getName());
                File file = chooser.getSelectedFile();
                try {
                    BufferedReader br = null;
                    String sCurrentLine;
                    br = new BufferedReader(new FileReader(file
                            .getAbsoluteFile()));
                    while ((sCurrentLine = br.readLine()) != null) {
                        jStyledTextPane.read(br, null);
                    }
                } catch (IOException e1) {
                    System.out.println("problem accessing file"
                            + file.getAbsolutePath());
                }
            }
            // jStyledTextPane.setText("You chose to open this file: "
            // + chooser.getSelectedFile().getName());
        }
    });

    // Save file
    fileItem2.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent e) {
            System.out.println("Pressed menu item! Save");
            jStyledTextPane.setText("Pressed menu item! Save");
        }
    });

    return menubar;
}

private void initialiseGUI() {

    // Create the frame.
    JFrame frame = new JFrame("CSC9V4 Text Editor");

    // Set the exit button.
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

    // Adding the menu bar to the frame.
    frame.setJMenuBar(menubar());

    // Size the frame.
    frame.setSize(600, 600);

    // Show the frame.
    frame.setVisible(true);

    jStyledTextPane = new JStyledTextPane();

    // Adding the JStyledTextPane to the frame.
    frame.add(jStyledTextPane);
}

@SuppressWarnings("unused")
public static void main(String[] args) {
    CSC9V4TextEditor TextEditor = new CSC9V4TextEditor();
}

public CSC9V4TextEditor() {
    initialiseGUI();
}

@Override
public void actionPerformed(ActionEvent e) {
    // TODO Auto-generated method stub

}

}

Answer 1

要保存JTextPane的内容，您可以使用正确的序列化方式serialize DefaultStyledDocument JTextPane deserialize个文件。如果您想再次加载内容，可以JTextPane相同并将其显示在import javax.swing.*; import javax.swing.text.*; import java.awt.*; import java.awt.event.*; import java.io.*; public class SaveEditor extends JFrame implements ActionListener{ public static final String text = "As told by Wikipedia\n" +"Java is a general-purpose, concurrent, class-based, object-oriented computer programming language." + "It is specifically designed to have as few implementation " + "dependencies as possible. It is intended to let application developers write once, run anywhere (WORA), " + "meaning that code that runs on one platform does not need to be recompiled to run on another. " + "Java applications are typically compiled to bytecode (class file) that can run on any Java virtual " + "machine (JVM) regardless of computer architecture. Java is, as of 2012, one of the most popular programming " + "languages in use, particularly for client-server web applications, with a reported 10 million users."; JTextPane pane ; DefaultStyledDocument doc ; StyleContext sc; JButton save; JButton load; public static void main(String[] args) { try { UIManager.setLookAndFeel("com.sun.java.swing.plaf.windows.WindowsLookAndFeel"); SwingUtilities.invokeLater(new Runnable() { public void run() { SaveEditor se = new SaveEditor(); se.createAndShowGUI(); } }); } catch (Exception evt) {} } public void createAndShowGUI() { setTitle("TextPane"); sc = new StyleContext(); doc = new DefaultStyledDocument(sc); pane = new JTextPane(doc); save = new JButton("Save"); load = new JButton("Load"); JPanel panel = new JPanel(); panel.add(save);panel.add(load); save.addActionListener(this);load.addActionListener(this); final Style heading2Style = sc.addStyle("Heading2", null); heading2Style.addAttribute(StyleConstants.Foreground, Color.red); heading2Style.addAttribute(StyleConstants.FontSize, new Integer(16)); heading2Style.addAttribute(StyleConstants.FontFamily, "serif"); heading2Style.addAttribute(StyleConstants.Bold, new Boolean(true)); try { doc.insertString(0, text, null); doc.setParagraphAttributes(0, 1, heading2Style, false); } catch (Exception e) { System.out.println("Exception when constructing document: " + e); System.exit(1); } getContentPane().add(new JScrollPane(pane)); getContentPane().add(panel,BorderLayout.SOUTH); setSize(400, 300); setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); setVisible(true); } public void actionPerformed(ActionEvent evt) { if (evt.getSource() == save) { save(); } else if (evt.getSource() == load) { load(); } } private void save()//Saving the contents . { JFileChooser chooser = new JFileChooser("."); chooser.setDialogTitle("Save"); int returnVal = chooser.showSaveDialog(this); if(returnVal == JFileChooser.APPROVE_OPTION) { File file = chooser.getSelectedFile(); if (file != null) { FileOutputStream fos = null; ObjectOutputStream os = null; try { fos = new FileOutputStream(file); os = new ObjectOutputStream(fos); os.writeObject(doc); JOptionPane.showMessageDialog(this,"Saved successfully!!","Success",JOptionPane.INFORMATION_MESSAGE); } catch (Exception ex) { ex.printStackTrace(); } finally { if (fos != null) { try { fos.close(); } catch (Exception ex){} } if (os != null) { try { os.close(); } catch (Exception ex){} } } } else { JOptionPane.showMessageDialog(this,"Please enter a fileName","Error",JOptionPane.ERROR_MESSAGE); } } } private void load()//Loading the contents { JFileChooser chooser = new JFileChooser("."); chooser.setDialogTitle("Open"); chooser.setFileSelectionMode(JFileChooser.FILES_ONLY); int returnVal = chooser.showOpenDialog(this); if(returnVal == JFileChooser.APPROVE_OPTION) { File file = chooser.getSelectedFile(); if (file!= null) { FileInputStream fin = null; ObjectInputStream ins = null; try { fin = new FileInputStream(file); ins = new ObjectInputStream(fin); doc = (DefaultStyledDocument)ins.readObject(); pane.setStyledDocument(doc); JOptionPane.showMessageDialog(this,"Loaded successfully!!","Success",JOptionPane.INFORMATION_MESSAGE); } catch (Exception ex) { ex.printStackTrace(); } finally { if (fin != null) { try { fin.close(); } catch (Exception ex){} } if (ins != null) { try { ins.close(); } catch (Exception ex){} } } } else { JOptionPane.showMessageDialog(this,"Please enter a fileName","Error",JOptionPane.ERROR_MESSAGE); } } } }上。考虑下面给出的代码：

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如何使用JMenu在textpane上使用相同的内容？

1 个答案: